11
(2) Voltage range
：
-30~30V input impedance >1M
Ω;
(3) Current measure
：
input impedance
<40Ω;
Note 3:
The excitation power supply for RTD measure is 0.2mA, and each position has 4-wire, 3-wire, and 2-wire
methods. The accuracy is as follows: (given accuracy data in the table in based on 4-wire)
(1) The accuracy of the 3-wire method is 10m
Ω
more than the accuracy of the 4-wire method;
(2) The accuracy of the 2-wire method is 50m
Ω
more than the accuracy of the 4-wire method.
Note 4
：
Minimum threshold voltage for frequency and pulse measure
：
2.5V;
Note 5
：
The frequency measure supports following units: Hz, kHz, MHz, CPM, CPH, s, ms,
μ
s
Note 6
：
There are rising edge and falling edge trigger mode available for pulse measure.
1.2.3 Simulate RTD measure accuracy (environmental temp.: 20±10
℃
)
Table 3 Simulate RTD measure accuracy
Sensor type
Temperature(
℃
)
Annual accuracy(
℃
)
PT10(385)
-200
～
850
-200
～
200
0.59
200
～
600
0.72
600
～
850
0.82
PT25(385)
-200
～
850
-200
～
200
0.27
200
～
600
0.35
